<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    p::first-line {
      color: aquamarine;
    }
    .w-100 {
      width: 666px;
    }
    .w-100::first-line {
      color: blanchedalmond;
    }
  </style>
</head>
<body>
  <p>this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test.</p>
  <p>这是测试
    这是测试this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test.
  </p>
  <div class="w-100">this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test.this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test.this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test. this is test.</div>
</body>
</html>